Francisco Mar-Grafias, a 22-year-old man from Round Rock, filmed himself sexually assaulting a 16-year-old girl and uploaded the video on Facebook. The girl's mother saw it and reported it to the police. (Williamson County Jail)

A Texas mom found a video that showed her 16-year-old daughter naked and unconscious after a man who allegedly sexually assaulted her posted the disturbing clip to Facebook, police said.

Francisco J. Mar-Grafias, 22, of Round Rock, Texas, was charged with felony aggravated sexual assault of a child on Dec. 5 after the supposed booze and drug-filled romp left the teen passed out. He is being held on $40,000 bond at Williamson County Jail.

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The teen was allegedly offered cocaine and alcohol by Mar-Grafias at his home on Nov. 21, KXAN reported. When she awoke, the teen said she was naked in Mar-Grafias' bed and he told her he used a condom, according the arrest report.

Mar-Grafias might have gotten away with it, except he posted a video detailing the sex assault to Facebook and the girl's mother saw it before she even made it home, KTBC reported.

"There may be a pride factor involved; you can never tell … I think there's a bragging right to put that stuff out there," Round Rock Police Sgt. Darin Bayles told KXAN. "Perhaps they want to draw attention to themselves about what they are doing and may, in some sense, believe in their own mind that it's not illegal or wrong."

The video shows Mar-Grafias touching the girl and panning to show the passed out girl's naked body from head to toe, according to KTBC.